<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>条件渲染</title>
</head>
<script src="./js/react.development.js"></script>
<script src="./js/react-dom.development.js"></script>
<!-- 引入 babel  将jsx语法 转换为 js语法 -->
<script src="./js/babel.min.js"></script>
<body>
    <div id="root"> </div>
</body>
<script type="text/babel">
    let isvip=true;

    let vdom;

    isvip?vdom=null:vdom=<h1>这是广告</h1>
   ReactDOM.render(vdom,document.getElementById("root"));
</script>
</html>